not all extension ports are recognized

my build with L203, 2x xS30, 1x xS40 communicates now without any trouble so far.
today i started to wire all the rest of the buttons in the house and i noticed that the DIs of the xS30 go from 01 to 18 but 19 to 24 are missing from evoks webapp and are not reported via webservices either (output sorted for convenience):